Massage mat



FIG. 1 is a front, top and right side perspective view of a massage mat, showing my new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is an enlarged view of portion 3 shown in FIG. 1 ;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a bottom plan view thereof.

The dot-dash broken lines depict the boundaries of the enlargements and form no part of the claimed design. 

CLAIM The ornamental design for a massage mat, as shown and described. 